<template>
      <div class="col-md-4">
    <form class="form-horizontal">
      <div class="form-group">
        <label>用户名</label>
        <input type="text" class="form-control" placeholder="用户名"
        v-model="comment.username" />
      </div>
      <div class="form-group">
        <label>评论内容</label>
        <textarea
          class="form-control"
          rows="6"
          placeholder="评论内容"
          v-model="comment.content"
        ></textarea>
      </div>
      <div class="form-group">
        <div class="col-sm-offset-2 col-sm-10">
          <button type="button" class="btn btn-default pull-right" @click="add">提交</button>
        </div>
      </div>
    </form>
  </div>
</template>

<script>
export default {
    name:"AddComment",
    props:{
      addComment:{
        type:Function,
        required:true,
      },
    },
    data(){
      return{
        comment:{
          username:"",
          content:'',
        },
      };
    },
    methods:{
      add(){
        let { username, content } = this.comment;
        if(!username){
          alert('用户名不能为空')
          return;
        }
        if (!content){
          alert('评论内容不能为空')
          return;
        }
        this.addComment(this.comment);
        this.comment.username = '';
        this.comment.content = '';
      }
    }
}
</script>